I'd like to put in a plug for the Joyetech eVic Primo Mini or SE as a non-DNA, single battery mod. (The Mini and SE are virtually identical, with the Mini having a slightly bigger screen.) The Mini/SE is exactly the same height as the P80, but is a little thinner and a tiny bit deeper, and it has a very pleasing slight egg shape when viewed from the top, which fits the hand nicely and makes it feel smaller than the P80. (By comparison, I find the P80 to be a little chunky and a little clicky, and it's so symmetrical that I often try to click the wrong side.)
The Primo mates beautifully with an Imp and a Sai, and using sur_myevic I get the same performance I get from a P80. But a Splinter overhangs asymmetrically and seems to fit the P80 much better.